This is a kind of place that you can go to and have a good time while enjoying great beer. I am probably a little bit younger than the average craft beer enthusiast, and for me, this was exactly what I wanted. This place had excellent beer selection, a knowledgeable staff, awesome ambiance, and a really hopping nighttime crowd. I like being able to drink awesome beer like Mikkeller Kaffe IPA and Nogne O Single Hop, while also being able to mingle with local Norwegians. If this is too loud for you, I understand, but this place deserves to be rated WAY higher than 76. Downside is that it was a wee bit more expensive.

Went there with some collegues on a friday night. Had booked a table in advance and also toured the brewery.
Had a very enjoyable evening, with excellent food (I had a burger), and awesome beers made by the brewery.

Went with a couple of friends on a Wednesday evening, despite the time of the week the place was packed and we were lucky to get a table. The place is nice but quite small, they’ve managed to utilize the space in a good manner though, and given the very limited toilet facilities it’s probably a good thing the place isn’t bigger. They had a very impressive amount of micro beers on tap, along with Guinness, Old Speckled Hen, and a couple of dull lagers. At the time they had their standard Kjell Hop, which was nice, and a brilliant seasonal Løkka Haust brewed by Kinn. The bottle selection is nice but not as huge as you’ll find at some of the other places in Oslo. I didn’t try the food, but the sausages smelt freaking amazing. The place has also got a satellite project going at the newly opened Vulkan Mathallen a few blocks to the west.

Updated rating: Finally back again after four years. The pub is much the same, but know they are a brewpub, which wasn’t the case back in 2010. Beer selection is impressive, I tried seven of their own beers from tap. Well, the quality isn’t top notch, not bad, but decent enough. Their best beer this evening was Løkka CDA (Black IPA) A big plus is that the brewpub offers 4 x 20 cl to 155 kroner (Nok) I had two of those! Helpful and knowledgeable staff. (Visited December 6th 2014)
First of all, the Google map location for Grunerløkka Brygghus is wrong. It is not situated that far from the city centre. It is nearby The Nighthawk Diner and Aku Aku Tiki Bar just south of Birkelunden Park. We entered the place a cold evening a Tuesday in November. It was crowded but a pleasant atmosphere. The beers on tap were shown on a chalk board. I headed for their house brew from Nøgne Ø, Single Hop Citra IPA alias "Kjell Pop Single Hop" A good beer! (Visited November 23rd 2010) Total score: 72

Visited on February 20th, 2011. Great looking place, self-service (order at the bar and they bring you your order), lots of great beer, good prices and the food was very fresh, very good and and the prices were reasonable (You know you’ve been in Oslo too long when 17€ for fish and chips reasonable). Definitely a must-visit in my opinion. My first choice when I go back to Oslo will be this place.

This place had the second smallest toilet I’ve seen at a bar - my butt kept setting off the hand dryer. Of course, that’s a small complaint when the tap list is so good, and the bottle list so varied. I do wish they had a printed or online bottle list though. Staff was extremely kniwledgeable and fruendly. Worth going well out of you way for.